One-dimensional topological superconductors are predicted to host zero-energy Majorana fermions at their extremities. Here, the authors observe dispersive edge states in a monolayer of Pb/Si(111) coupled to a ferromagnetic domain.

It was first shown that if we consider only those electric and magnetic phenomena which can be exactly expressed by equations containing only electric, magnetic and gravitational quantities, with those of length, mass and time, that there are an infinite number of theories possible. If we suppose that the electric and magnetic quantities are such a...